League Cup has weird rules. If the first leg ends in 0-0 and the second game ends in 1-1 there's extra time. If there's no further score in extra time the away team wins. So why not declare the away team winners after full time? It doesn't make sense.
It's all a ruse to confuse Benfica, who will be so busy studying the hidden meaning behind the bibs that they'll completely forget their tactical preparation.